Signal Space Cooperative Communication Essay Example | Topics and Well Written Essays - 750 words

Signal Space Cooperative Communication - Essay ExampleThis is potential with the help of expanded constellation also it enables the coating to combine the received signals in the broadcast phase and the relay phase. Later the performance of the SSC scheme is analysed and numerical results ar obtained, with the help of that result two design criteria are derived so that it can achieve the maximum performance from the system. Spatial diversity techniques are utilize in order to increase system reliability also it wont affect the bandwidth or performance. We use cooperative diversity as election to achieve special diversity, where antenna diversity become impractical due to size and power limitation of mobile devices. The concept of cooperation among users to provide diversity was introduced by Sendonaris, and then Laneman (Motahari, Ahmadzadeh & Khandani) derived the formulation for cooperative diversity based on two cooperative schemes, namely Amplify and Forward (AF), and Decode and Forward (DF). Signal home diversity was introduced by Belfiore and Boulle (Motahari, Ahmadzadeh & Khandani), which is achieved with the modulation signal space. Here we spread information carried by each signal point across all components of that finicky signal point. And then send each component through an independent channel. The performance of the cooperative schemes, which uses the signal space diversity, is affected by the performance of the source-relay channel. Meanwhile, a method called Signal Space Cooperative (SSC) scheme has been proposed to overcome this problem however, which is not easy to scale larger constellations. And also here we take an assumption, that the destination is aware of whether the relay participates in the cooperative scheme or not. Signal Space Cooperative Scheme SSC scheme is the major proposal by this paper. To process SSC scheme, first we have to see the Constellation Expansion Algorithm that enables the relay to effectively cooperate duri ng the course of transmission. Then, the broadcast phase and the relay phase signals are described followed by a discussion on how the destination decodes received signals. Constellation Expansion In order to achieve maximum diversity gain, each two signal points in the system constellation must have the maximum number of distinct components. Let us consider